If you watch Harold and Kumar go to Guantanamo Bay backwards, it's about two stoners that run into some rednecks and Neil Patrick Harris, sneak into Guantanamo Bay, and convince Homeland Security to put them on a plane from Amsterdam to the US with a smokeless bong.

if you watch the Cube backwards it's about these bunch of people who sneak into a cube structure and fight their way to the deeps of the structure eventually getting new people to join them, to then fall into a good sleep